A simming republic is a term used to denote a sim club or group that elects its leaders and posses a council of club members who discuss and vote on important club matters. Many clubs elect their leader or have a council, but to be considered a republic, clubs must have both elements.

Many, but not all, republics have a constitution or charter that spells out the organization of the club.

Simming republics began to take shape immediately after America Online and other major online services of the era introduced unlimited billing in late 1996 and early 1997. Prior, simmers were limited to 5 hours (later 20 hours) of online time a month, which forced clubs to be organized along strict hierarchical lines with little time for discussion.

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